Two-Channel Interleaved Buck LED Driver Using Current-Balancing Capacitor

This paper introduces an automatic current-balancing multichannel light-emitting diode (LED) driver. The proposed topology is simple in structure, low cost, and can achieve automatic current balancing for multistring LED applications. Owing to the charge-balancing condition of the capacitor, the LED...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2018-09, Vol.6 (3), p.1306-1313
Main Authors: Do, Duc-Tuan, Cha, Honnyong, Nguyen, Bang Le-Huy, Kim, Heung-Geun
Format: Article
Language:English
Subjects:
Automatic current balancing
Capacitors
charge balancing
Circuits
current unbalance
double step down
Inductors
Integrated circuits
Light emitting diodes
light-emitting diode (LED) driver
Power electronics
Regulators
series capacitor
Voltage control
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Summary:This paper introduces an automatic current-balancing multichannel light-emitting diode (LED) driver. The proposed topology is simple in structure, low cost, and can achieve automatic current balancing for multistring LED applications. Owing to the charge-balancing condition of the capacitor, the LED channel currents are automatically equalized without requiring any dedicated control or extra circuitry. Thus, there is only one current-controlled circuit necessary to adjust all LED channel currents. The operating principle and phase-shifted pulsewidth modulation control of the proposed two-channel LED driver are analyzed in detail. The extension to multichannel applications is also discussed. A 25-W hardware prototype was built and tested; the experimental results are provided for validation.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2018.2845858